/*
* Copyright 2004-2019 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.table;
import org.h2.command.dml.Select;
import org.h2.expression.Expression;
import org.h2.expression.ExpressionColumn;
import org.h2.value.Value;
A column resolver is list of column (for example, a table) that can map a
column name to an actual column.
/**
* A column resolver is list of column (for example, a table) that can map a
* column name to an actual column.
*/
public interface ColumnResolver {
Get the table alias.
Returns: the table alias
/**
* Get the table alias.
*
* @return the table alias
*/
String getTableAlias();
Get the column list.
Returns: the column list
/**
* Get the column list.
*
* @return the column list
*/
Column[] getColumns();
Get derived column name, or null
. Params: - column – column
Returns: derived column name, or null
/**
* Get derived column name, or {@code null}.
*
* @param column column
* @return derived column name, or {@code null}
*/
String getDerivedColumnName(Column column);
Get the list of system columns, if any.
Returns: the system columns or null
/**
* Get the list of system columns, if any.
*
* @return the system columns or null
*/
Column[] getSystemColumns();
Get the row id pseudo column, if there is one.
Returns: the row id column or null
/**
* Get the row id pseudo column, if there is one.
*
* @return the row id column or null
*/
Column getRowIdColumn();
Get the schema name.
Returns: the schema name
/**
* Get the schema name.
*
* @return the schema name
*/
String getSchemaName();
Get the value for the given column.
Params: - column – the column
Returns: the value
/**
* Get the value for the given column.
*
* @param column the column
* @return the value
*/
Value getValue(Column column);
Get the table filter.
Returns: the table filter
/**
* Get the table filter.
*
* @return the table filter
*/
TableFilter getTableFilter();
Get the select statement.
Returns: the select statement
/**
* Get the select statement.
*
* @return the select statement
*/
Select getSelect();
Get the expression that represents this column.
Params: - expressionColumn – the expression column
- column – the column
Returns: the optimized expression
/**
* Get the expression that represents this column.
*
* @param expressionColumn the expression column
* @param column the column
* @return the optimized expression
*/
Expression optimize(ExpressionColumn expressionColumn, Column column);
}